Incorrect Billing adding Midnight to Daytime Data

Reference *** dated 17 June 2015 - Technical Department for Investigation<br> Reference Number: ***<br> Cell C Customer Care Case Number: *** <br> On 31 May 2015 my available balance was 55 MB.<br> I have a Smart Data Post Paid 10 GB package.<br> On the June statement, for the May usage, you charge me R 374.85 additional for data usage.<br> On the itemised billing I notice that you are incorrectly billing me by adding the Midnight Data to the Daytime Data as follows:<br> 30 May 2015 - 00:42:08 for R 241.41 (should be from free Giganite usage)<br> 30 May 2015 - 17:31:38 for R 59.71<br> 31 May 2015 - 00:41:39 for R 71.80 (should be from free Giganite usage)<br> 31 May 2015 - 18:07:17 for R 1.93<br> You are incorrectly billing me, as the midnight data should be accounted for separately from the SmartData.<br> Calculation of 55 MB available at 31 May 2015:<br> Total usage as per itemised bill = ***6<br> Less incorrect billing method: (364735 +70475 +86661 + 2254) = 524125<br> Amount available at 31 May 2015: (***6 - 524125)<br> (***6 - 524125) - 10 000 000 = 55409 on 31 May 2015.<br> Since 17 June no one has even bothered to talk to me in person.<br>